<template>
  <div class="login_container">
    <div class="longin_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 登录区域 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="LoginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //  登录表单的数据绑定
      loginForm: {
        username: "admin",
        password: "123456"
      },
      LoginFormRules: {
        //   验证用户名是否合法
        username: [
          {
            required: true,
            message: "输入登录名称",
            trigger: "blur"
          },
          {
            min: 3,
            max: 10,
            message: "长度在3到10个字符",
            trigger: "blur"
          }
        ],
        //  验证密码是否合法
        password: [
          {
            required: true,
            message: "请输入登录密码",
            trigger: "blur"
          },
          {
            min: 6,
            max: 15,
            message: "长度在6到15个字符",
            trigger: "blur"
          }
        ]
      }
    };
  },
  methods: {
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields();
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) {
          return;
        }
        const { data: res } = await this.$http.post("login", this.loginForm);
        if (res.meta.status !== 200) return this.$message.error("登录失败");
        this.$message.success("登录成功");
        // 1.将登录成功之后的token保存到客户端的sessionStorage种
        //  1.1项目中除了登录之外的其他API接口，必须在登录之后才能访问
        //  1.2 token只应在当前网站打开期间有效，所以将token保存在sessionStorage中
        // console.log(res);
        window.sessionStorage.setItem("token", res.data.token);
        // 2.通过编程时导航跳转到后台主页，路由地址是/home
        this.$router.push("/home");
      });
    }
  }
};
</script>

// 加上scoped，样式只在当前组件生效，否则在全局生效
<style lang="less" scoped>
.login_container {
  height: 100%;
  background-color: #2b4b6b;
}

.longin_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.avatar_box {
  width: 130px;
  height: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-sizing: border-box;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
</style>